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reverseproxy: Support HTTP/3 transport to backend (#6312)

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Closes #5086
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Matt Holt 2024-05-20 13:06:43 -06:00 committed by GitHub
parent a6a45ff6c5
commit 5f6758dab5
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1 changed files with 22 additions and 0 deletions
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22
modules/caddyhttp/reverseproxy/httptransport.go
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@ -31,6 +31,7 @@ import (
"time"
"github.com/pires/go-proxyproto"
"github.com/quic-go/quic-go/http3"
"go.uber.org/zap"
"golang.org/x/net/http2"
@ -124,12 +125,18 @@ type HTTPTransport struct {
// can be specified to use H2C (HTTP/2 over Cleartext) to the
// upstream (this feature is experimental and subject to
// change or removal). Default: ["1.1", "2"]
//
// EXPERIMENTAL: "3" enables HTTP/3, but it must be the only
// version specified if enabled. Additionally, HTTPS must be
// enabled to the upstream as HTTP/3 requires TLS. Subject
// to change or removal while experimental.
Versions []string `json:"versions,omitempty"`
// The pre-configured underlying HTTP transport.
Transport *http.Transport `json:"-"`
h2cTransport *http2.Transport
h3Transport *http3.RoundTripper // TODO: EXPERIMENTAL (May 2024)
}
// CaddyModule returns the Caddy module information.
@ -350,6 +357,16 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
}
}
// configure HTTP/3 transport if enabled; however, this does not
// automatically fall back to lower versions like most web browsers
// do (that'd add latency and complexity, besides, we expect that
// site owners control the backends), so it must be exclusive
if len(h.Versions) == 1 && h.Versions[0] == "3" {
h.h3Transport = new(http3.RoundTripper)
} else if len(h.Versions) > 1 && sliceContains(h.Versions, "3") {
return nil, fmt.Errorf("if HTTP/3 is enabled to the upstream, no other HTTP versions are supported")
}
// if h2c is enabled, configure its transport (std lib http.Transport
// does not "HTTP/2 over cleartext TCP")
if sliceContains(h.Versions, "h2c") {
@ -414,6 +431,11 @@ func (h *HTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) {
transport.SetScheme(req)
// use HTTP/3 if enabled (TODO: This is EXPERIMENTAL)
if h.h3Transport != nil {
return h.h3Transport.RoundTrip(req)
}
// if H2C ("HTTP/2 over cleartext") is enabled and the upstream request is
// HTTP without TLS, use the alternate H2C-capable transport instead
if req.URL.Scheme == "http" && h.h2cTransport != nil {